自然対流膜沸騰熱伝達に関する研究 : 第2報, 水平下向き平面における膜沸騰

概要

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Natural-convection film boiling heat transfer from a horizontal flat plate facing downward has been analyzed by assuming the liquid-vapor interface to be smooth because the interface is expected to be stable from viewpoint of the Rayleigh-Taylor instability. However, experimental results show that these analyses considerably underpredict the heat transfer coefficient. In the present study, an experimental study is conducted to examine such discrepancy. The results otained can be summarized as follows. The liquid-vapor interface remains smooth for film boiling in small wall-superheat region, but the interface becomes to be wavy as wall-superheat increases. The transition superheat increases with increasing subcooling and decreasing intensity of external disturbance. The heat transfer coefficient of film boiling with wavy interface is larger than that with smooth interface. A simple analytical model is developed to predict the saturated film boiling heat transfer with smooth interface. The agreement between the analytical model and the experimental data is good as long as the interface is smooth.
一般社団法人日本機械学会の論文
1991-04-25